Journal
MATERIALS & DESIGN
Volume 47, Issue -, Pages 443-448Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2012.12.021
Keywords
Wet grinding process; High energy density stirred bead mill; Nano-sized alumina particles; Electroless nanocomposite coating
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Electroless Ni-P-Al2O3 nanocomposite coatings were deposited on steel surface from a plating solution with alumina (alpha-Al2O3) nano-particles prepared by mechanical milling in a high energy density ceramic stirred bead mill. The size and specific surface area of the nano-sized alumina particles were determined by acoustic particle sizer and nitrogen adsorption surface area analyzer. The phase structure, morphology and elemental composition of Ni-P-Al2O3 nano-composite coatings were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), respectively. Effect of the nanoparticle concentration in the plating bath on the micro-hardness, wear resistance and corrosion resistance of the as-deposited and the heat-treated coatings was investigated. The results show that the incorporation of alumina nanoparticles can enhance the micro-hardness and wear resistance of electroless Ni-P-Al2O3 nanocomposite coatings, but affect the corrosion resistance. (C) 2012 Elsevier Ltd. All rights reserved.
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